We participated in the UK and Republic of Ireland May Measurement Month 2021 (MMM21) campaign to raise awareness about blood pressure (BP) measurement and the dangers posed by elevated BP and hypertension. In addition, the campaign aimed to collect and report levels of BP awareness and control in the community setting. The MMM21 campaign set up opportunistic community screening sites at hospitals, general practice (GP) surgeries, community pharmacies, gyms, and various other public places. The campaign screened 1322 participants (mean age 46 years, 55% women) and found that 522 (39.5%) had hypertension (systolic BP ≥ 140 mmHg and/or diastolic BP ≥ 90 mmHg or on antihypertensive medication) at the time of testing. Of the 522 participants identified with hypertension, only 47.2% were aware of their condition. Of those on antihypertensive medication, only 45.7% had controlled BP (systolic BP < 140 mmHg and diastolic BP < 90 mmHg), and of all hypertensives, only 19.0% were controlled. Our UK and Ireland data continue to shed further light on low levels of awareness and control of hypertension in the UK and Ireland community setting. This evidence supports a critical need to further highlight the importance of identifying and taking action against raised BP.